COMS/MI-based retrieval of Broadband Land Surface Albedo over Northeast Asia
- Abstract
- This thesis examines surface broadband albedo as one of the Essential Climate Variable (ECV)s including analysis of entire estimation procedures such as atmospheric correction, Bi-directional Reflectance Distribution Function (BRDF) modeling and narrow conversion to broadband albedo. For the first, we tested 6S based Look-Up Table (LUT) for atmospheric correction. Atmospheric correction is important pre-processing that removed interference by atmospheric contents (scattering effect of aerosol and gases observing effect). 6S is verified accuracy by a lot of previous studies and widely used to atmospheric correction. It can be applied various optical sensor within shortwave range. After 6S based LUT test, we employed LUT for atmospheric correction using Communication, Ocean and Meteorological Satellite (COMS)/Meteorological Imager (MI) data. BRDF modeling is mandatory step to estimate surface albedo because it can describe bi-directional reflectance which occurred in general land surface. The National Aeronautics and Space Administration (NASA) and European Organisation for the Exploitation of Meteorological satellite (EUMETSAT) have provided surface albedo using different BRDF models: Ross-Li and Roujean model respectively. We examined the performance of each BRDF and selected which one is suitable for our environmental condition. In addition to, analysis are carried out using comparison estimated albedo from each BRDF model with Moderate Resolution Imaging Spectroradiometer (MODIS) albedo product. Both BRDF models have strengths and weaknesses, we selected Roujean model due to feature of albedo estimation procedures. Each step had been tested using Satellite Pour I’Obervation de la Terra (SPOT)/VEGETAION (VGT) and applied to COMS/MI data. Finally, broadband albedo are retrieved that have high correlation coefficient (over 0.79 in black sky, 0.73 in white sky) and low error (under 0.019 in black sky, 0.023 in white sky) when compared with SPOT/VGT albedo product.
- Issued Date
- 2016
- Awarded Date
- 2016. 2
- Type
- Dissertation
- Keyword
- surface albedo COMS/MI Northeast Asia
- Publisher
- 부경대학교 대학원
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 지구환경시스템과학부공간정보시스템공학전공
- Advisor
- 한경수
- Table Of Contents
- TABLE OF CONTENTS................................................ Ⅰ
LIST OF FIGURES ....................................................... Ⅴ
LIST OF TABLES ................................................... XIXⅥ
LIST OF LEGENDS .................................................. ⅩⅨ
ABSTRACT .......................................................... ⅩⅩⅨ
CHAPTER 1: GENERAL INTRODUCTION ........................ 1
1.1. Problem ............................................................... 2
1.1.1. Atmospheric correction ........................................ 4
1.1.2. Bi-directional Reflectance Distribution (BRD) effect .. 5
1.2. Objectives of this research ..................................... 7
1.2.1. Specific objectives .............................................. 8
1.3. Synthesis methodology .......................................... 9
1.4. Structure of the thesis ........................................... 14
CHAPTER 2: STUDY AREA AND DATA EXTRACTION ..... 15
2.1. Study area .......................................................... 16
2.2. Used Data ........................................................... 21
2.2.1. Top of Atmospheric reflectance data .................... 21
2.2.2. L2 and L3 product .............................................. 25
2.2.3. Auxiliary data .................................................... 31
2.2.4. Validation data .................................................. 32
2.2.5. Validation data .................................................. 34
2.3. Pre-processing ................................................... 36
CHAPTER 3: FEASIBILITY OF ATMOSPHERIC CORRECTION USING 6S BASED LUT AND APPLY TO COMS/MI L1B .......................................................... 39
3.1. Introduction ........................................................ 41
3.2. Method .............................................................. 45
3.2.1. Overview of the 6S RTM model (1997) ................. 51
3.2.2. Overview of the SMAC model (1994).................... 53
3.3. ANALYSIS AND RESULTS .................................... 55
3.3.1. Inter-comparisons of surface reflectance obtained from MOD09, SMAC, and the 6SV-based LUT ............... 55
3.3.2. Performance of the new 6S-based LUT ................ 66
3.3.3. Applied to COMS/MI L1B .................................... 71
3.4. SUMMARY .......................................................... 87
CHAPTER 4: ANALYSIS OF BRDF MODEL FOR SURFACE ALBEDO ESTIMATION AND IMPLEMENT FOR GEOSTATIONARY SATELLITE .................................... 90
4.1. Introduction ......................................................... 92
4.2. Methodology ....................................................... 93
4.2.1. Roujean Model (1992). ....................................... 95
4.2.2. Ross-Li model (2000). ....................................... 98
4.2.3. Normalisation of directional reflectance .............. 100
4.3. Result and Analysis ........................................... 102
4.3.1. Kernel analysis of two semi-empirical models ... 102
4.3.2. Empirical coefficients analysis ......................... 105
4.4. BRDF modeling applied to Geostationary satellite .. 111
4.5. Summery ......................................................... 115
CHAPTER 5: ESTIMATION SPECTRAL ALBEDO FOR POLAR ORBIT AND GEOSTATIONARY ORBIT SATELLITE ........................................................... 117
5.1. Introduction ..................................................... 119
5.2. Methodology ................................................... 120
5.2.1. Kernel integration with angle components ........ 122
5.3. Comparison between albedo from each BRDF model .................................................................. 126
5.4. Estimation spectral albedo using COMS/MI data .. 134
5.5. Summery ......................................................... 151
CHAPTER 6: CONVERSINO NARROW ALBEDO TO BROADBAND ALBEDO USING POLAR AND GEOSTATIONARY SATELLITE .................................. 153
6.1. Introduction ....................................................... 155
6.2. Methodology ..................................................... 157
6.3. Result and analysis ........................................... 158
6.4. Estimation broadband albedo based on COMS/MI . 165
6.5. Summery .......................................................... 178
CHAPTER 7: GENERAL CONCLUSION AND RECOMMENDATIONS .............................................. 180
7.1. Conclusions ............................................................ 181
7.1.1. Atmospheric correction using 6S based LUT ....... 181
7.1.2. Analysis of BRDF and conducting ...................... 182
7.1.3. Estimation of spectral albedo and convert to broadband ............................................................... 184
7.2. Recommendations for the further research ............ 185
REFERENCES ......................................................... 187
- Degree
- Doctor
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- 대학원 > 지구환경시스템과학부-공간정보시스템공학전공
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